Circuit breaker
By incorporating structures such as air blow holes and baffles into the circuit breaker, the problems of slow breaking speed and contact burnout in the circuit breaker have been solved, achieving rapid breaking and improved reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DELIXI ELECTRIC
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-15
AI Technical Summary
Existing circuit breakers have a slow breaking speed under abnormal circuit conditions, and the moving and stationary contacts are easily burned out.
By opening air blowing holes on the extension plate of the arc-blocking support in the circuit breaker, high-temperature and high-pressure gas forms an airflow in the containment cavity, increasing the airflow speed to accelerate the tripping speed of the tripping mechanism. The damage of high-temperature and high-pressure gas to the tripping mechanism is reduced by the partition and protective plate, and the structural stability is ensured by the support and limiting protrusion.
It improves the breaking speed of the circuit breaker, reduces the possibility of burn-out of the moving and stationary contacts, and enhances the reliability and maintainability of the circuit breaker.
Smart Images
Figure CN224248577U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of switch technology, specifically to a circuit breaker. Background Technology
[0002] Circuit breakers generally include a tripping mechanism, an electromagnetic drive mechanism, moving contacts, and stationary contacts.
[0003] When the moving contact and the stationary contact are in contact, the circuit current is conducted and the circuit breaker operates normally.
[0004] When an abnormal situation occurs in the circuit where the circuit breaker is located, causing an increase in the current in the circuit, the moving contact is pushed open under the action of electro-repulsive force. At the same time, the electromagnetic drive mechanism can drive the tripping mechanism to trip, further causing the moving contact to rotate to the open position, thereby disconnecting the current in the circuit where the circuit breaker is located.
[0005] In the case of circuit breakers in the present technology, the breaking speed is slow when abnormal conditions occur in the circuit, and the moving contacts and stationary contacts are easily burned. Utility Model Content
[0006] This application provides a circuit breaker for improving the breaking speed of the circuit breaker and reducing the possibility of burnt-out moving and stationary contacts.
[0007] To achieve the above objectives, this application provides a circuit breaker, including a base, a moving contact, an arc-blocking support, a tripping mechanism, and an electromagnetic drive mechanism. The base has a receiving cavity with an open end and a closed end disposed opposite to each other. The moving contact is rotatably mounted on the base and disposed within the receiving cavity. The arc-blocking support is located at the open end and is disposed at the top of the cavity wall of the receiving cavity. The tripping mechanism has a support frame disposed on the arc-blocking support. The tripping mechanism has a first driving end and a first acting end, with the moving contact disposed at the first acting end, and the tripping mechanism is used to drive the moving contact to rotate relative to the base. The electromagnetic drive mechanism is disposed on the base and has a second driving end and a second acting end. The first driving end corresponds to the second acting end, and the electromagnetic drive mechanism is used to drive the tripping mechanism to trip. The arc-blocking support has an extension plate extending towards the closed end on the side near the electromagnetic drive mechanism. An air-blowing hole is provided on the extension plate, communicating with the receiving cavity, and the air outlet side of the air-blowing hole corresponds to the second driving end.
[0008] When the above technical solution is adopted, if an abnormal situation occurs in the circuit where the circuit breaker is located, causing the current in the circuit where the circuit breaker is located to increase, the moving contact will be pushed open under the action of Holm repulsion and electro-repulsion. At the same time, an electric arc and high-temperature and high-pressure gas will be generated between the moving contact and the stationary contact, and the gas will form an airflow in the containment cavity.
[0009] In this application, the arc-blocking support is provided with an extension plate extending towards the closed end on the side near the electromagnetic drive mechanism. An air blowing hole is provided on the extension plate, which is connected to the receiving cavity. The air outlet side of the air blowing hole corresponds to the second drive end.
[0010] Thus, when the gas flows into the receiving cavity and reaches the extension plate, it is blocked by the extension plate, forcing some of the gas to accumulate at the extension plate location. Simultaneously, the air blast hole allows the gas to flow out. As the gas flows through the air blast hole, its velocity increases, and the airflow from the air blast hole acts on the second drive end, causing the second drive end to move away from the air blast hole.
[0011] This increases the force on the second driving end, which can increase the speed at which the second driving end moves towards the first driving end.
[0012] At this point, not only is the tripping speed of the tripping mechanism accelerated, causing the moving contact to rotate quickly to the open position and increasing the circuit breaker's breaking speed, but the force exerted by the second acting end on the first driving end is also increased, ensuring that the tripping mechanism can trip and guaranteeing the circuit breaker's breaking effect.
[0013] In one possible implementation, the moving contact has a rotating end and a contact end disposed opposite to each other, with the rotating end rotatably mounted on a base. A partition is also provided on the base, with the direction from the open end to the closed end parallel to the partition. The partition divides the receiving cavity into an arc-extinguishing chamber and a receiving space, the receiving space being located on the side closer to the electromagnetic drive mechanism. The rotating end is located within the receiving space, and a first clearance groove corresponding to the moving contact is formed on the partition, through which the contact end extends into the arc-extinguishing chamber.
[0014] When the above technical solution is adopted, a first clearance groove corresponding to the moving contact is provided on the partition plate so that the contact end can extend into the arc extinguishing chamber through the first clearance groove. At the same time, it can also provide space for the moving contact to rotate.
[0015] The partition reduces the amount of high-temperature, high-pressure gas flowing into the containment space when the moving and stationary contacts disengage, thus minimizing damage to the tripping mechanism. Simultaneously, the partition reduces contamination of the tripping mechanism by particles such as carbon dust generated during this process, lowering the likelihood of the mechanism becoming energized. Furthermore, it provides better phase-to-phase insulation protection, ensuring the breaking performance of the circuit breaker's incoming lines.
[0016] In one possible implementation, the arc-blocking support includes two opposing support portions in a direction perpendicular to the direction from the open end to the closed end; the support portions are disposed at the top of the side cavity wall of the accommodating space, and the bearing frame is disposed on the support portions.
[0017] When the above technical solution is adopted, the two oppositely arranged support parts form a stable support for the load-bearing frame in a direction perpendicular to the direction from the open end to the closed end. When the tripping mechanism generates force due to vibration or electromagnetic force, the support parts can disperse and transfer the stress to the side cavity wall of the accommodating space, avoiding local stress concentration and ensuring that the circuit breaker maintains a stable structural shape during normal operation.
[0018] In one possible implementation, the arc-blocking support further includes a protective plate, with its two sides connected to the sides of the two supports away from the base, respectively, to form a protective space facing the receiving space. A support frame is positioned outside the protective space, and a through hole is provided on the protective plate through which the connecting rod of the release mechanism extends into the protective space.
[0019] When the above technical solution is adopted, the arc-blocking support forms a protective space facing the receiving space, and the bearing frame is set outside the protective space. The arc-blocking support can reduce the damage of high-temperature and high-pressure gas to the tripping mechanism. At the same time, it can also reduce the contamination of the tripping mechanism by carbon powder and other particles generated when the moving contact and stationary contact separate, reduce the possibility of the tripping mechanism becoming energized, and further, better play the role of phase-to-phase insulation protection, ensuring the breaking performance of the circuit breaker's reverse-current line.
[0020] The protective plate has a through hole so that the connecting rod of the tripping mechanism can extend into the protective space through the through hole, so that the first working end can act on the rotating shaft to drive the moving contact to rotate.
[0021] In one possible implementation, the arc-isolating support further includes a baffle plate disposed on the side of the support near the arc-extinguishing chamber, with the baffle plate located at the top of the partition plate. The baffle plate is parallel to the partition plate, and a second clearance groove corresponding to the first clearance groove is formed on the baffle plate.
[0022] When the above technical solution is adopted, the baffle can reduce the amount of high-temperature and high-pressure gas generated when the moving contact and the stationary contact are separated from each other and flow into the containment space and the protection space, thereby reducing the damage of high-temperature and high-pressure gas to the tripping mechanism.
[0023] Meanwhile, the baffle can also reduce the contamination of the tripping mechanism by carbon dust and other particles generated when the moving and stationary contacts disengage, thus reducing the possibility of the tripping mechanism becoming energized. Furthermore, it can better provide phase-to-phase insulation protection, ensuring the breaking performance of the circuit breaker's incoming lines.
[0024] The baffle has a second clearance groove corresponding to the first clearance groove, which can provide space for the rotation of the moving contact and avoid the baffle from interfering with the rotation of the moving contact.
[0025] In one possible implementation, the support has a mounting groove on the side for connecting the support frame.
[0026] When adopting the above technical solution, on the one hand, the mounting groove provides a clear installation position for the support frame. During installation, the corresponding part of the support frame can be placed into the mounting groove, which can shorten the adjustment and positioning time between the support frame and the arc-damping support, and shorten the circuit breaker installation cycle.
[0027] On the other hand, when the support frame needs to be disassembled for maintenance and then reinstalled, the mounting slot can ensure that the support frame can be installed in the same position each time, so that the relative position of the tripping mechanism and the arc-blocking support remains consistent, reducing the risk of equipment failure that may be caused by the accumulation of repeated installation errors, and improving the reliability and maintainability of the circuit breaker.
[0028] Furthermore, the mounting groove acts as a mechanical limiter for the support frame, restricting its movement in multiple directions. This prevents the support frame from shifting horizontally or vertically due to external forces such as vibration and impact during circuit breaker operation, ensuring that the support frame remains firmly fixed to the support.
[0029] In one possible implementation, a limiting protrusion is provided on the side of the support for connecting to the carrier frame, and the limiting protrusion is used to make limiting contact with the carrier frame.
[0030] When the above technical solution is adopted, the limiting protrusion can mechanically limit the movement of the support frame in multiple directions. It can prevent the support frame from shifting horizontally or vertically due to external forces such as vibration and impact during the operation of the circuit breaker, ensuring that the support frame is always firmly fixed to the support.
[0031] In one possible implementation, the support frame has a groove at the location where it connects with the support portion. The limiting protrusion includes a first protrusion and a second protrusion, the inner side of the first protrusion making limiting contact with the outer wall of the support frame, and the second protrusion being used to mate with the groove.
[0032] When the above technical solution is adopted, on the one hand, it provides a clear installation position for the support frame. During the installation process, the groove of the support frame can be matched with the second protrusion, which can shorten the adjustment and positioning time between the support frame and the arc-blocking support, and shorten the circuit breaker installation cycle.
[0033] On the other hand, when the support frame needs to be disassembled for maintenance and then reinstalled, the second protrusion matches the groove, which can ensure that the support frame can be installed in the same position each time. This keeps the relative position of the tripping mechanism and the arc-blocking support consistent, reducing the risk of equipment failure that may be caused by the accumulation of repeated installation errors, and improving the reliability and maintainability of the circuit breaker.
[0034] In addition, the first and second protrusions act as mechanical limiters for the support frame, restricting its movement in multiple directions. This prevents the support frame from shifting horizontally or vertically due to external forces such as vibration and impact during circuit breaker operation, ensuring that the support frame remains firmly fixed to the support.
[0035] In one possible implementation, the arc-blocking support, the tripping mechanism, and the base are connected by a threaded connection structure.
[0036] When using the above technical solution, the arc-blocking support, tripping mechanism, and base are detachably connected, requiring no complex processes or tools, allowing for rapid assembly and simple, convenient operation. Furthermore, it facilitates disassembly and maintenance of the arc-blocking support, tripping mechanism, and base. The arc-blocking support, tripping mechanism, and base can also be replaced individually, saving costs.
[0037] In one possible implementation, the number of air blowing holes is multiple.
[0038] When the above technical solution is adopted, the possibility of high temperature and high pressure gas accumulating in the containment cavity is reduced. Attached Figure Description
[0039] Figure 1 A partial structural diagram of the circuit breaker provided in the embodiments of this application. Figure 1 .
[0040] Figure 2 A partial structural diagram of the circuit breaker provided in the embodiments of this application. Figure 2 .
[0041] Figure 3 A partial structural diagram of the circuit breaker provided in the embodiments of this application. Figure 3 .
[0042] Figure 4 A partial structural diagram of the circuit breaker provided in the embodiments of this application. Figure 4 .
[0043] Figure 5 Schematic diagram of the arc-blocking support provided in the embodiments of this application Figure 1 .
[0044] Figure 6 Schematic diagram of the arc-blocking support provided in the embodiments of this application Figure 2 .
[0045] Explanation of reference numerals in the attached figures:
[0046] 1-Base, 11-Baffle, 2-Moving contact, 3-Arc-blocking support, 31-Air blow hole, 32-Support part, 321-Mounting groove
[0047] 322-Limiting protrusion, 3221-First protrusion, 3222-Second protrusion, 33-Protective plate, 331-Through hole.
[0048] 34-Baffle, 341-Second clearance groove, 35-Extension plate, 4-Releasing mechanism, 41-Bearing frame, 5-Electromagnetic drive mechanism.
[0049] 51-Support frame, 52-Armature, 53-Spring, 6-Stationary contact. Detailed Implementation
[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.
[0052] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0053] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0054] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.
[0055] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).
[0056] Please refer to Figure 1 and Figure 2 As shown in the figure, this application provides a circuit breaker, which includes a base 1, a moving contact 2, an arc-blocking support 3, a tripping mechanism 4, and an electromagnetic drive mechanism 5. The base 1 has a receiving cavity with an open end and a closed end arranged opposite to each other.
[0057] In practice, the circuit breaker also includes a stationary contact 6, combined with... Figure 1 , Figure 3 and Figure 4 As shown, the stationary contact 6 is fixedly mounted on the base 1.
[0058] Specifically, when the moving contact 2 and the stationary contact 6 are in contact, the circuit current is conducted and the circuit breaker operates normally. When an abnormal situation occurs in the circuit where the circuit breaker is located, the moving contact 2 and the stationary contact 6 disengage, and the circuit current is interrupted.
[0059] In practice, the number of moving contacts 2 and the number of stationary contacts 6 are the same and correspond one-to-one.
[0060] A circuit breaker may include one, two, or three circuits, each circuit including at least one moving contact 2 and one stationary contact 6. Accordingly, the number of housing cavities is the same as the number of circuits, and they correspond one-to-one.
[0061] In addition, the number of arc-blocking support 3, tripping mechanism 4 and electromagnetic drive mechanism 5 can be the same as the number of moving contacts 2. Of course, the number of arc-blocking support 3, tripping mechanism 4 and electromagnetic drive mechanism 5 can also be less than the number of moving contacts 2.
[0062] In the embodiments provided in this application, the number of moving contacts 2, the number of stationary contacts, the number of arc-blocking support members 3, the number of tripping mechanisms 4, and the number of electromagnetic drive mechanisms 5 are not limited here, and are subject to the actual situation.
[0063] Accordingly, the specific structures of the base 1, moving contact 2, arc-blocking support 3, tripping mechanism 4, and electromagnetic drive mechanism 5 are not limited here, and shall be subject to the actual situation.
[0064] The moving contact 2 is rotatably mounted on the base 1. When the moving contact 2 rotates towards the stationary contact and makes contact with the stationary contact, the current in the circuit where the circuit breaker is located is conducted. When the moving contact 2 rotates away from the stationary contact and loses contact with the stationary contact, the current in the circuit where the circuit breaker is located is disconnected.
[0065] The moving contact 2 is disposed within the receiving cavity, that is, the moving contact 2 is disposed inside the base 1.
[0066] In fact, the circuit breaker also includes a middle cover and a cover body. The middle cover is set on the base 1, and the cover body is set on the side of the middle cover away from the base 1. The base 1, the middle cover, and the cover body form the housing of the circuit breaker.
[0067] In this way, the housing can accommodate the moving contact 2 and other components of the circuit breaker housed within the housing, providing a stable space for the moving contact 2 and other components, ensuring that the moving contact 2 can work normally without external interference.
[0068] At the same time, the housing also serves a positioning and support function, preventing the components housed within it from shifting or being damaged during operation. The housing can also withstand a certain amount of external pressure, protecting components such as the moving contact 2 from damage.
[0069] In addition, the casing has a protective function, preventing moisture, dust, dirt and other impurities from entering the casing, thereby avoiding corrosion or damage to the components installed inside the casing.
[0070] The arc-blocking support 3 is located at the opening end and is disposed at the top of the cavity wall of the receiving cavity.
[0071] It should be noted that the receiving cavity has an open end and a closed end that are positioned opposite each other. Figure 2 Taking the circuit breaker placement shown as an example, the closed end is the bottom surface of the base 1. The arc-blocking support 3 is set at the top of the base 1.
[0072] like Figure 1 and Figure 2 As shown, in practice, in the direction perpendicular to the direction from the open end to the closed end, that is, along the length of the cavity, both ends of the cavity also have open ends. This makes the cavity a U-shaped cavity, with a bottom cavity wall and two opposing side cavity walls.
[0073] The method by which the arc-damping support 3 is mounted on the base 1 is not specifically limited here. For example, the arc-damping support 3 can be mounted on the base 1 by welding, riveting, or other methods.
[0074] The tripping mechanism 4 has a support frame 41, which is mounted on the arc-blocking support 3.
[0075] The specific structure of the tripping mechanism 4 is not specifically limited here, nor is the specific manner in which the bearing frame 41 is set on the arc-blocking support 3.
[0076] The tripping mechanism 4 is mounted on the arc-blocking support 3 via the support frame 41. By mounting the support frame 41 on the arc-blocking support 3, the tripping mechanism 4 is mounted on the arc-blocking support 3.
[0077] The tripping mechanism 4 has a first driving end and a first working end. The moving contact 2 is disposed at the first working end. The tripping mechanism 4 is used to drive the moving contact 2 to rotate relative to the base 1.
[0078] The moving contact 2 is located at the first working end of the tripping mechanism 4. When the tripping mechanism 4 is activated, it can drive the moving contact 2 to rotate relative to the base 1 so that the moving contact 2 can contact or disengage from the stationary contact.
[0079] In practical implementation, the circuit breaker also includes a rotating shaft, which is rotatably mounted on the base 1. The rotating end of the moving contact 2 is movably mounted on the rotating shaft, and the rotating end of the moving contact 2 moves synchronously with the rotating shaft.
[0080] When there are multiple moving contacts 2, there can be only one rotating shaft, with the multiple moving contacts 2 movably mounted on the rotating shaft. Of course, this is not the only practical application.
[0081] Combination Figures 1 to 4 As shown, the release mechanism 4 includes a connecting rod and a traction rod, wherein the traction rod is the first driving end of the release mechanism 4, and the end of the connecting rod near the rotating shaft is the first working end.
[0082] In fact, the connecting rod acts on the rotating shaft, thereby causing the moving contact 2 to rotate relative to the base 1.
[0083] The electromagnetic drive mechanism 5 is disposed on the base 1. The electromagnetic drive mechanism 5 has a second drive end and a second action end. The first drive end corresponds to the second action end. The electromagnetic drive mechanism 5 is used to drive the tripping mechanism 4 to trip.
[0084] It should be noted that the first driving end corresponds to the second acting end, and the second acting end can act on the first driving end, thereby driving the tripping mechanism 4 to trip.
[0085] As an example, such as Figure 3 and Figure 4 As shown, the electromagnetic drive mechanism 5 may include a support frame 51, which is disposed on the base 1, and the electromagnetic drive mechanism 5 is mounted on the base 1 through the support frame 51.
[0086] The electromagnetic drive mechanism 5 may also include an armature 52, a magnetic material, and a spring 53.
[0087] The armature 52 is rotatably mounted on the support frame 51 at its center, and the magnetic material is fixedly mounted on the support frame 51, with the magnetic material located on the side of the armature 52 furthest from the moving contact 2. Thus, the armature 52 is positioned between the magnetic material and the air blow hole 31.
[0088] The end of the armature 52 closest to the magnetic material is the second driving end of the electromagnetic drive mechanism 5, and the other end of the armature 52 closest to the traction rod is the second working end.
[0089] The two ends of the spring 53 act elastically on the second working end and the support frame 51 respectively, and are used to apply a force away from the traction rod to the second working end.
[0090] In practice, when the moving contact 2 contacts the stationary contact and the circuit current of the circuit breaker is conducting, the magnetic material will generate an electromagnetic force. The second driving end, under the action of the electromagnetic force, will move towards the magnetic material. In this case, the second operating end will move towards the traction rod.
[0091] The spring 53 is designed so that the armature 52 can overcome the electromagnetic force of the magnetic material, so as to prevent the second action terminal from acting on the first drive terminal when the circuit breaker is working normally, causing the trip unit to trip and the circuit breaker to short circuit.
[0092] When an abnormal situation occurs in the circuit where the circuit breaker is located, causing the current in the circuit where the circuit breaker is located to increase, the moving contact 2 is pushed open under the action of Holm repulsion and electrodynamic repulsion. At the same time, an electric arc and high-temperature and high-pressure gas will be generated between the moving contact 2 and the stationary contact, and the gas will form an airflow in the containment cavity.
[0093] Furthermore, when an abnormal situation occurs in the circuit where the circuit breaker is located, causing an increase in the current, the electromagnetic force generated by the magnetic material increases accordingly, exceeding the elastic force of the spring 53. At this time, the second driving end is acted upon by the electromagnetic force and moves towards the magnetic material, while the second acting end moves towards the first driving end, causing the armature 52 to strike the traction rod, thus disengaging the tripping mechanism 4. Further, this can drive the rotating shaft to rotate the moving contact 2 to the open position.
[0094] In the embodiments provided in this application, the arc-blocking support member 3 is provided with an extension plate 35 extending toward the closed end on the side near the electromagnetic drive mechanism 5. An air blowing hole 31 is provided on the extension plate 35. The air blowing hole 31 is connected to the receiving cavity, and the air outlet side of the air blowing hole 31 corresponds to the second drive end.
[0095] Thus, when an abnormal situation occurs in the circuit where the circuit breaker is located, the gas generated between the moving contact 2 and the stationary contact flows into the receiving cavity and is blocked by the extension plate 35, forcing some of the gas to accumulate at the position of the extension plate 35. At the same time, the air blow-out hole 31 allows the gas to flow out through it. When the gas flows through the air blow-out hole 31, the gas velocity increases, and the airflow from the air blow-out hole 31 acts on the second driving end, causing the second driving end to move away from the air blow-out hole 31, that is, towards the magnetic material.
[0096] The second driving end is subjected to a combined force from the airflow and the magnetic material, which increases the force on the second driving end and accelerates its movement towards the magnetic material. Correspondingly, this increases the speed at which the second driving end moves towards the first driving end.
[0097] At this time, not only is the tripping speed of the tripping mechanism 4 accelerated, causing the moving contact 2 to rotate quickly to the open position and increasing the circuit breaker's breaking speed, but the force exerted by the second acting end on the first driving end is also increased, ensuring that the tripping mechanism 4 can trip and guaranteeing the circuit breaker's breaking effect.
[0098] In specific implementation, the size and structure of the air blowing hole 31 are not limited here, but shall be subject to the actual situation. For example, the air blowing hole 31 can be circular, rectangular, or other structures, but of course, it is not limited to these.
[0099] The number of air blowing holes 31 can be multiple to reduce the possibility of high-temperature and high-pressure gas accumulating in the containment cavity. For example, the number of air blowing holes 31 can be two, three or more, which is not limited here and depends on the actual situation.
[0100] In practice, the side of the extension plate 35 near the closed end can fit against the bottom wall of the receiving cavity, and the side of the extension plate 35 can fit against the side wall of the receiving cavity. This allows the gas flowing to the position of the extension plate 35 to flow out through the air blow-out hole 31, increasing the flow rate of the gas flowing out through the air blow-out hole 31. This increases the force exerted by the gas on the second drive end, further improving the breaking performance of the circuit breaker.
[0101] In practice, the extension plate 35 can be installed on the arc-damping support 3 by welding, riveting, snap-fitting, or other methods. Alternatively, the extension plate 35 can be integrally formed with the arc-damping support 3. That is, the extension plate 35 can be formed simultaneously with the arc-damping support 3.
[0102] In one possible implementation, the moving contact 2 has a rotating end and a contact end that are disposed opposite to each other, with the rotating end rotatably disposed on the base 1.
[0103] In fact, the rotating end can be fixedly mounted on the rotating shaft, and the rotating shaft can be rotatably mounted on the base 1, thereby realizing the function of the moving contact 2 being rotatably mounted on the base 1.
[0104] A partition 11 is also provided on the base 1, with the direction from the open end to the closed end parallel to the partition 11.
[0105] The partition 11 can be installed on the base 1 by welding, riveting, snap-fitting, or other methods. Of course, the partition 11 can also be integrally formed with the base 1. That is, the partition 11 is formed at the same time as the base 1 is formed.
[0106] The partition 11 divides the housing into an arc-extinguishing chamber and a housing space, with the housing space located on the side closest to the electromagnetic drive mechanism 5. The rotating end is located within the housing space, thus it can be seen that the rotating shaft and the first actuating end are both located within the housing space.
[0107] like Figure 1 As shown, the partition plate 11 has a first clearance groove corresponding to the moving contact 2, so that the contact end can extend into the arc extinguishing chamber through the first clearance groove, and at the same time, it can also provide rotation space for the moving contact 2.
[0108] The partition 11 reduces the amount of high-temperature, high-pressure gas flowing into the containment space when the moving contact 2 and the stationary contact disengage, thus reducing damage to the tripping mechanism 4. Simultaneously, the partition 11 also reduces contamination of the tripping mechanism 4 by carbon dust and other particles generated when the moving contact 2 and the stationary contact disengage, lowering the possibility of the tripping mechanism 4 becoming energized. Furthermore, it better serves as phase-to-phase insulation protection, ensuring the breaking performance of the circuit breaker's incoming line.
[0109] In practice, the number of partitions 11 is the same as the number of moving contacts 2, and they correspond one-to-one.
[0110] In some embodiments, combined with Figures 2 to 6 As shown, in a direction perpendicular to the direction from the open end to the closed end, the arc-blocking support 3 includes two opposing support portions 32, which are disposed at the top of the side cavity wall of the accommodating space, and the bearing frame 41 is disposed on the support portion 32.
[0111] An arc-blocking support 3 includes two support portions 32, one of which is correspondingly disposed at the top of a side cavity wall. In this case, the two opposing support portions 32 form a stable support for the load-bearing frame 41 in a direction perpendicular to the direction from the open end to the closed end. When the tripping mechanism 4 experiences force due to vibration or electromagnetic force, the support portion 32 can disperse and transfer the stress to the side cavity wall of the accommodating space, avoiding localized stress concentration and ensuring that the circuit breaker maintains a stable structural form during normal operation.
[0112] The connection method between the support part 32 and the base 1 is not specifically limited here. For example, welding, riveting, or other methods can be used to connect the support part 32 and the base 1. Of course, it is not limited to this in practice.
[0113] As an example, combined Figures 3 to 6 As shown, the arc-blocking support 3 also includes a protective plate 33. The two sides of the protective plate 33 are respectively connected to the side of the two support parts 32 away from the base 1, so that the arc-blocking support 3 forms a protective space facing the receiving space. The bearing frame 41 is set outside the protective space. The protective plate 33 has a through hole 331, and the connecting rod of the release mechanism 4 extends into the protective space through the through hole 331.
[0114] Thus, the arc-blocking support 3 forms a protective space facing the receiving space, and the bearing frame 41 is set outside the protective space. The setting of the arc-blocking support 3 can reduce the damage of high temperature and high pressure gas to the tripping mechanism 4.
[0115] At the same time, it can also reduce the contamination of the tripping mechanism 4 by carbon powder and other particles generated when the moving contact 2 and the stationary contact are separated, reduce the possibility of the tripping mechanism 4 being energized, and further, can better play the role of phase-to-phase insulation protection, ensuring the breaking performance of the circuit breaker's reverse-current line.
[0116] The protective plate 33 has a through hole 331 so that the connecting rod of the tripping mechanism 4 can extend into the protective space through the through hole 331, so that the first working end can act on the rotating shaft to drive the moving contact 2 to rotate.
[0117] In practice, the protective plate 33 can be integrally formed with the two support parts 32. Alternatively, the two support parts 32 can be set on both sides of the protective plate 33 by welding, riveting or snap-fitting.
[0118] The specific forming method of the arc-blocking support 3 is not specifically limited here, but shall be subject to the actual situation.
[0119] In one alternative approach, such as Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the arc-quenching support 3 provided in this embodiment of the application also includes a baffle 34, which is disposed on the side of the support portion 32 near the arc-extinguishing chamber, and the baffle 34 is located at the top of the partition 11. The baffle 34 is parallel to the partition 11, and a second clearance groove 341 corresponding to the first clearance groove is provided on the baffle 34.
[0120] In this case, the baffle 34 can reduce the amount of high-temperature and high-pressure gas generated when the moving contact 2 and the stationary contact separate from each other and flow into the containment space and the protection space, thereby reducing the damage of high-temperature and high-pressure gas to the tripping mechanism 4.
[0121] Meanwhile, the baffle 34 can also reduce the contamination of the tripping mechanism 4 by carbon powder and other particles generated when the moving contact 2 and the stationary contact disengage, thus reducing the possibility of the tripping mechanism 4 becoming energized. Furthermore, it can better serve as a phase-to-phase insulation protection, ensuring the breaking performance of the circuit breaker's reverse-current line.
[0122] The baffle 34 has a second clearance groove 341 corresponding to the first clearance groove, which can provide space for the rotation of the moving contact 2 and avoid the baffle 34 from interfering with the rotation of the moving contact 2.
[0123] The two sides of the baffle 34 are connected to the two support parts 32 respectively, the top of the baffle 34 is connected to one side of the protective plate 33, and the lower end of the baffle 34 can fit against the top of the partition 11.
[0124] In practice, the baffle 34, the protective plate 33, and the support part 32 can be integrally formed. Of course, welding, riveting, or snap-fitting can also be used to connect the baffle 34 to the support part 32 and the baffle 34 to the support part 32.
[0125] In some embodiments, please combine Figure 1 , Figure 5 and Figure 6 The support part 32 has a mounting groove 321 on the side for connecting the support frame 41.
[0126] When adopting the above technical solution, on the one hand, the mounting groove 321 provides a clear installation position for the support frame 41. During the installation process, the corresponding part of the support frame 41 can be placed into the mounting groove 321, which can shorten the adjustment and positioning time between the support frame 41 and the arc-blocking support 3, and shorten the circuit breaker installation cycle.
[0127] On the other hand, when the support frame 41 needs to be disassembled for maintenance and then reinstalled, the mounting slot 321 can ensure that the support frame 41 can be installed in the same position each time, so that the relative position of the tripping mechanism 4 and the arc-blocking support 3 remains consistent, reducing the risk of equipment failure that may be caused by the accumulation of repeated installation errors, and improving the reliability and maintainability of the circuit breaker.
[0128] Furthermore, the mounting groove 321 acts as a mechanical limiter for the support frame 41, restricting its movement in multiple directions. It prevents the support frame 41 from shifting horizontally or vertically due to external forces such as vibration and impact during circuit breaker operation, ensuring that the support frame 41 is always firmly fixed to the support part 32.
[0129] The number of mounting slots 321 provided on the support 32 can be one, two, or three, etc., and is not specifically limited here. The shape and size of the mounting slots 321 are also not specifically limited here.
[0130] As a possible approach, the support 32 is provided with a limiting protrusion 322 on the side of the support 32 that is used to connect to the support frame 41, and the limiting protrusion 322 is used to make limiting contact with the support frame 41.
[0131] Thus, the limiting protrusion 322 can mechanically limit the movement of the support frame 41 in multiple directions. It can prevent the support frame 41 from being displaced horizontally or vertically due to external forces such as vibration and impact during the operation of the circuit breaker, ensuring that the support frame 41 is always firmly fixed on the support part 32.
[0132] In one example, the support frame 41 has a groove at the position where it connects with the support portion 32. The limiting protrusion 322 includes a first protrusion 3221 and a second protrusion 3222. The inner part of the first protrusion 3221 makes limiting contact with the outer wall of the support frame 41, and the second protrusion 3222 is used to match the groove.
[0133] Thus, the second protrusion 3222 matches the groove, providing a clear installation position for the support frame 41. During installation, the groove of the support frame 41 can be matched with the second protrusion 3222, which can shorten the adjustment and positioning time between the support frame 41 and the arc-blocking support 3, and shorten the circuit breaker installation cycle.
[0134] On the other hand, when the support frame 41 needs to be disassembled for maintenance and then reinstalled, the second protrusion 3222 matches the groove, which can ensure that the support frame 41 can be installed in the same position each time, so that the relative position of the tripping mechanism 4 and the arc-blocking support 3 remains consistent, reducing the risk of equipment failure that may be caused by the accumulation of repeated installation errors, and improving the reliability and maintainability of the circuit breaker.
[0135] In addition, the first protrusion 3221 and the second protrusion 3222 provide mechanical restraint for the support frame 41, limiting its movement in multiple directions. This prevents the support frame 41 from shifting horizontally or vertically due to external forces such as vibration and impact during circuit breaker operation, ensuring that the support frame 41 is always firmly fixed to the support 32.
[0136] As a feasible approach, the arc-blocking support 3, the tripping mechanism 4, and the base 1 are connected by a threaded connection structure.
[0137] It should be noted that the arc-blocking support 3, the tripping mechanism 4, and the corresponding positions of the base 1 are connected by the same threaded connection structure.
[0138] This can shorten the installation time between the arc-blocking support 3, the tripping mechanism 4, and the base 1.
[0139] This also indicates that the arc-blocking support 3, the tripping mechanism 4, and the base 1 are detachably connected, requiring no complex processes or tools, allowing for quick assembly and simple, convenient operation. Furthermore, it facilitates disassembly and maintenance of the arc-blocking support 3, the tripping mechanism 4, and the base 1. The arc-blocking support 3, the tripping mechanism 4, and the base 1 can also be replaced individually, saving costs.
[0140] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other spacers; a physical connection can also be a detachable connection, such as a snap-fit or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
Claims
1. A circuit breaker, characterized in that, include: A base, wherein a receiving cavity is provided on the base, the receiving cavity having an open end and a closed end disposed opposite to each other; A movable contact is rotatably mounted on the base; the movable contact is disposed within the receiving cavity; An arc-blocking support is located at the opening end; the arc-blocking support is disposed at the top of the cavity wall of the receiving cavity; A tripping mechanism has a support frame disposed on the arc-blocking support member; the tripping mechanism has a first driving end and a first acting end; a moving contact is disposed on the first acting end, and the tripping mechanism is used to drive the moving contact to rotate relative to the base; An electromagnetic drive mechanism is disposed on the base; the electromagnetic drive mechanism has a second drive end and a second action end; the first drive end corresponds to the second action end, and the electromagnetic drive mechanism is used to drive the tripping mechanism to trip; the arc-blocking support member is provided with an extension plate extending towards the closed end on the side near the electromagnetic drive mechanism, and an air blowing hole is provided on the extension plate, the air blowing hole is connected to the receiving cavity, and the air outlet side of the air blowing hole corresponds to the second drive end.
2. The circuit breaker according to claim 1, characterized in that, The moving contact has a rotating end and a contact end that are disposed opposite to each other, and the rotating end is rotatably disposed on the base; The base is also provided with a partition, and the direction from the open end to the closed end is parallel to the partition; The partition divides the receiving cavity into an arc-extinguishing chamber and a receiving space; the receiving space is located on the side closer to the electromagnetic drive mechanism; the rotating end is located in the receiving space, and a first clearance groove corresponding to the moving contact is provided on the partition, and the contact end extends into the arc-extinguishing chamber through the first clearance groove.
3. The circuit breaker according to claim 2, characterized in that, In a direction perpendicular to the direction from the open end to the closed end, the arc-blocking support includes two opposing support portions; the support portions are disposed at the top of the side cavity wall of the accommodating space, and the bearing frame is disposed on the support portions.
4. The circuit breaker according to claim 3, characterized in that, The arc-blocking support also includes a protective plate, the two sides of which are respectively connected to the side of the two supports away from the base, so that the arc-blocking support forms a protective space facing the receiving space; the bearing frame is disposed outside the protective space; a through hole is provided on the protective plate, and the connecting rod of the release mechanism extends into the protective space through the through hole.
5. The circuit breaker according to claim 3, characterized in that, The arc-blocking support also includes a baffle plate disposed on the side of the support near the arc-extinguishing chamber, and the baffle plate is located at the top of the partition plate; the baffle plate is parallel to the partition plate, and a second clearance groove corresponding to the first clearance groove is provided on the baffle plate.
6. The circuit breaker according to claim 3, characterized in that, The support portion has a mounting groove on one side for connecting to the carrier frame.
7. The circuit breaker according to claim 3, characterized in that, The support portion is provided with a limiting protrusion on one side for connecting to the carrier frame, and the limiting protrusion is used to make limiting contact with the carrier frame.
8. The circuit breaker according to claim 7, characterized in that, The support frame has a groove at the position where it connects with the support part; the limiting protrusion includes a first protrusion and a second protrusion, the inner side of the first protrusion makes limiting contact with the outer wall of the support frame, and the second protrusion is used to match the groove.
9. The circuit breaker according to claim 1, characterized in that, The arc-blocking support, the release mechanism, and the base are connected by a threaded connection structure.
10. The circuit breaker according to claim 1, characterized in that, The number of air blowing holes is multiple.